修改input标签placeholder文字颜色

input::-webkit-input-placeholder, textarea::-webkit-input-placeholder {
/* WebKit browsers */
color: #ccc;
}
input:-moz-placeholder, textarea:-moz-placeholder {
/* Mozilla Firefox 4 to 18 */
color: #ccc;
}
input::-moz-placeholder, textarea::-moz-placeholder {
/* Mozilla Firefox 19+ */
color: #ccc;
}
input:-ms-input-placeholder, textarea:-ms-input-placeholder {
/* Internet Explorer 10+ */
color: #ccc;